feat: new bun_build and bun_compile, extend bun_install

tests/bundle_test/verify_site_build.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+output_dir="$1"
+
+if [[ ! -d ${output_dir} ]]; then
+  echo "Expected output directory: ${output_dir}" >&2
+  exit 1
+fi
+
+if ! find -L "${output_dir}" -type f \( -name '*.js' -o -name '*.css' \) | grep -q .; then
+  echo "Expected Bun build assets in ${output_dir}" >&2
+  exit 1
+fi